乌兰巴托以西断裂活动时代的光释光年代学研究

doi:10.3969/j.issn.0253-4967.2013.02.011

地震地质 ›› 2013, Vol. 35 ›› Issue (2): 322-327.DOI: 10.3969/j.issn.0253-4967.2013.02.011

乌兰巴托以西断裂活动时代的光释光年代学研究

孙高元^1,2, 龚志军¹

1. 中国科学院地质与地球物理研究所, 北京 100029;
2. 中国科学院大学, 北京 100864

收稿日期:2012-12-26 修回日期:2013-05-13 出版日期:2013-06-30 发布日期:2013-07-11
基金资助:
国家自然科学基金(41272203)资助

OSL DATING OF FAULT ACTIVITY IN THE WEST OF ULAANBAATAR

SUN Gao-yuan^1,2, GONG Zhi-jun¹

1. Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;
2. University of Chinese Academy of Sciences,Beijing 100864,China

Received:2012-12-26 Revised:2013-05-13 Online:2013-06-30 Published:2013-07-11

摘要/Abstract

摘要：

蒙古乌兰巴托周边发育了多条活动断裂.以乌兰巴托以西的Emeelt和Hustai断裂为例,对相关断层开挖探槽,进行年代学研究.结果表明,Emeelt断裂以走滑运动为主,根据剖面错断地层和其上覆、下伏地层的光释光年代学研究结果,推断出该断层最新活动时间介于距今(9.6±1.0)ka和(11.3±1.3)ka之间; 对Hustai断裂开挖的新鲜剖面显示其为正断层,通过分析错断地层和其上覆堆积物的光释光定年结果,推断该断裂最新活动时间介于距今(0.87±0.08)ka和(24.2±4.9)ka之间,且可能更接近距今(0.87±0.08)ka.

关键词: 活动断层, 光释光测年, 晚第四纪, 乌兰巴托

Abstract:

Several faults are developed around Ulaanbaatar city. In this study,optically stimulated luminescence(OSL)dating is applied to the Emeelt and Hustai Faults in the west of Ulaanbaatar,in order to evaluate the hazards around Ulaanbaatar. Totally,two profiles are studied: the profile ET for the Emeelt Fault and the profile KI for the Hustai Fault. The fault-related sediments in the two profiles are dated by OSL dating to infer the date of the past fault activities. The OSL dating results for samples from profile ET suggest that the age of the last fault movement is between 9.6±1.0ka and 11.3±1.3ka. The deformed strata and the Heilu soil in the fault scarp on the Hustai Fault suggest a maximum age of 24.2±4.9ka and a minimum age of 0.87±0.08ka for the faulting.

Key words: active fault, OSL dating, late Quaternary, Ulaanbaatar

中图分类号:

P315.2

孙高元, 龚志军. 乌兰巴托以西断裂活动时代的光释光年代学研究[J]. 地震地质, 2013, 35(2): 322-327.

SUN Gao-yuan, GONG Zhi-jun. OSL DATING OF FAULT ACTIVITY IN THE WEST OF ULAANBAATAR[J]. SEISMOLOGY AND GEOLOGY, 2013, 35(2): 322-327.

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乌兰巴托以西断裂活动时代的光释光年代学研究

OSL DATING OF FAULT ACTIVITY IN THE WEST OF ULAANBAATAR

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